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High intensity UV radiation ozone treatment of nanocrystalline TiO 2 layers for high efficiency of dye-sensitized solar cells
Author(s)
Saekow, Samarn
Maiakgree, Wasan
Jarernboon, Wirat
Pimanpang, Samuk
Amornkitbamrung, Vittaya
Date Issued
September 1, 2012
Type
Conference Paper
Abstract
We have improved the conversion efficiency of dye-sensitized solar cells (DSSCs) by using high intensity UV-ozone treatment on nanocrystalline TiO 2 layers after sintering. The UV light sources used had powers of 1650 W and 500 W. UV-ozone treatment of nanocrystalline TiO 2 layers was performed for 10 min with a fixed distance between TiO 2 layers and UV light source of about 3 cm. Experimental results indicate that photocurrent and power conversion efficiency of cells increased when using high power 1650 W and 500 W UV-ozone treatment on TiO 2 layers. The short circuit current density (J sc) increased to 25.29 ± 0.23 mA/cm 2 and 22.22 ± 0.47 mA/cm 2, the open circuit voltage (V oc) to 0.73 ± 0.02 V and 0.74 ± 0.02 V, the fill factor (FF) to 0.66 ± 0.01 and 0.71 ± 0.03 and the power conversion efficiency to 11.95 ± 0.45% and 11.12 ± 0.28% respectively. The DSSCs were characterized for absorption dye, chemical structure on nanocrystalline TiO 2 layer and electrochemical properties by UV-visible spectroscopy, XPS, XRD, contact angle measurement and impedance spectroscopy respectively. © 2012 Elsevier B.V. All rights reserved.
Citation
Journal of Non Crystalline Solids, 358(17), 2496-2500, 2012